The Cedar Press, 1978
Buku Teks
Robertson, Arthur Henry, 1913-, author
Manchester University Press, 1992
Buku Teks
Cranston, Maurice
Manaktalas, 1962
Buku Teks
Buergenthal, Thomas
St. Paul Minn, 1988
Buku Teks
Cranston, Maurice
The Bodley Head, 1973
Buku Teks